[migration] add_workflow now ensure the entity type is actually workflowable, and a new make_workflowable migration function is available to make an entity type workflowable (closes #1382720)

from os.path import join
from cubicweb.toolsutils import create_dir

option_renamed('pyro-application-id', 'pyro-instance-id')

create_dir(join(config.appdatahome, 'backup'))